The physics quests (designed by Dolores Gende -- a fellow physics teacher) are a set of activities that students can do on their own: 1) as extension activities to tie a particular Physics topic to a common experience such as electricity, roller coasters, 2) as tutorials to reinforce concepts learned in the classroom or 3)as an exploration of topics that are not generally covered in class.
This is one of many good sites that she runs -- if you type in Dolores Gende AP physics you will get a good listing of them all